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wife
Novice
Jan 15, 2012, 2:27 PM
Post #1 of 10
(5361 views)
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I have a ford F-250 6.8L v10, in the last few weeks it has started running rough(sputtering) it does not backfire or die. we have pulled the codes and it always come up as random missfire of different cylinders. we have replaced the fuel filter and the camshaft position sensor.
the truck seems to run fine until it warms up and then it starts running rough, speed dose not matter, it runs rough the entire time.
when he changed the fuel filter the fuel that drained out of it was brownish.
About 3 months ago it blew a spark plug out, (this was after he had changed the plugs), and the husband put it back in and replaced the coil pack.
The truck is running bad enough that when you are driving down the road it will not shift into overdrive unless you let out of it but then when you accelerate it down shifts.
Thank you for any information or help you may be able to give.
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Discretesignals
Ultimate Carjunky
/ Moderator
Jan 15, 2012, 6:51 PM
Post #2 of 10
(5317 views)
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Hi Wife,
What year is this beast?
Is it skipping at idle speed?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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wife
Novice
Jan 16, 2012, 1:15 PM
Post #3 of 10
(5294 views)
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2000 and I might add that it has over 200,000 miles on it and that this is the first problem we have had with it.
I don't know if you would say skips but it does run rough at idle.
forgot to add that we pulled codes again last night and now in addition to the random missfire it has the code for cam shaft position sensor, which we replaced earlier in the day.
(This post was edited by wife on Jan 16, 2012, 1:19 PM)
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Discretesignals
Ultimate Carjunky
/ Moderator
Jan 16, 2012, 6:53 PM
Post #4 of 10
(5277 views)
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What is the code number for the camshaft sensor you are getting? Camshaft sensor is important on that because that is what sncyronizes the injectors to #1 TDC. If the injectors are not syncronized because of a camshaft sensor out of phase, that could cause the engine to run bad.
The P0300 as you may know tells you that you have a misfire in more than one cylinder. The problem with that code is that you don't know which cylinder(s) are missing. Fords are a big pain in the butt when trying to figure out who is missing because most scan tool don't have the capability of monitoring live misfire counts for all the cylinders. That means that to figure out which cylinders are missing, you have to go to a software level in the computer called mode $06.
Basically in a nut shell the computer runs tests to be sure everything is working and meeting the emission's requirements. In mode $06 the results of all those tests are stored. One of the tests performed is misfiring. You can look at the $06 data to figure out which cylinder are missing. Makes it a whole lot easier to find out who is missing.
If you have a dead misfire, which means the engine is missing all the time, you can isolate which cylinder(s) are skipping by unplugging injectors one at a time while the engine is running. This disables that cylinder for which ever injector you disable. Which ever cylinder(s) you disable don't change the running of the engine is the cylinder(s) that is missing.
Once you determine which ones are missing, you need to figure out why. That is when you check for spark, injector pulse, good compression, injector flow, etc. for those cylinders that are missing.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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wife
Novice
Jan 17, 2012, 4:31 PM
Post #5 of 10
(5261 views)
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sorry I should have been clear, we do know what cylinders misfire they just aren't the same ones everytime. codes have been pulled 4 times now with different cylinders each time.
that is what is so confusing about this problem.
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Discretesignals
Ultimate Carjunky
/ Moderator
Jan 17, 2012, 5:03 PM
Post #6 of 10
(5257 views)
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Which cylinders are missing and what is the cam code number you are getting?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jan 17, 2012, 5:03 PM)
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wife
Novice
Jan 18, 2012, 6:27 PM
Post #7 of 10
(5246 views)
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 Problem solved, camshaft sensor was a bad sensor out of the box took new sensor out and replaced it with another new one and it stopped that code, the real problem was moisture inside the spark plug well, changed plugs and coils boots and as I said the problem is solved.
Thanks for everthing just happy truck is running right again.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jan 18, 2012, 6:42 PM
Post #8 of 10
(5245 views)
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Why did it have moisture in the spark plug well? Does it have a coolant leak around the intake manifold?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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wife
Novice
Jan 19, 2012, 7:45 AM
Post #9 of 10
(5226 views)
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No it wasn't coolant, we are told it was a design flaw for some reason sometimes when you change out the spark plugs the coil boots do not reseal correctly, easy enough to fix and the boots are under $5.00 each.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jan 19, 2012, 8:58 AM
Post #10 of 10
(5221 views)
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That's nonsense. The moisture got in there from somewhere. It can only come from the top down.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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